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RAIDWatch User’s Manual
C.8. RAID 6
A RAID 6 array is essentially an extension of a RAID 5 array with a second
independent distributed parity scheme. Data and parity are striped on a
block level across multiple array members, just like in RAID 5, and a
second set of parity is calculated and written across all the drives.
The goal of this duplication is solely to improve fault tolerance; RAID 6 can
handle the failure of any two drives in the array while other single RAID
levels can handle at most one fault. This is a perfect solution when data is
mission-critical.
Figure C-7: RAID 6 Storage
C.9. RAID 10, 30, 50 and 60
Infortrend implements RAID 10, 30, 50 and 60 in the form of logical
volumes. Each logical volume consists of one or more logical drives. Each
member logical drive can be composed of a different RAID level. Members
of a logical volume are striped together (RAID 0); therefore, if all members
are RAID 3 logical drives, the logical volume can be called a RAID 30
storage configuration.
Using logical volumes to contain multiple logical drives can help manage
arrays of large capacity. It is, however, difficult to define the RAID level of
a logical volume when it includes members composed of different RAID
levels.
App-18 RAID Levels
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